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bottleneck |
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bottleneck
A bottleneck is an area that has a limited allowance for the movement of trains through it. For an example, four tracks converging into two then back into four tracks is a bottleneck due to the reduced number of tracks which limits the number of trains that can travel through such an area at any one time. Bottlenecks can be problematic in peak periods or when extra services are required than what can pass through without delays (ie waiting for a train to overtake and pass).
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